Underwater mask



FIG. 1 is a front perspective view of the underwater mask;

FIG. 2 is a front plan view thereof;

FIG. 3 is a right side view thereof with the left side view being a mirror image thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof. 

The ornamental design for an underwater mask, as shown and described. 